ISO 1 2016 © ISO 2016 Geometrical product specifications (GPS) — Standard reference temperature for the specification of geometrical and dimensional properties Spécification géométrique des produits[.]
INTERNATIONAL STANDARD ISO Third edition 2016-09-01 Geometrical product specifications (GPS) — Standard reference temperature for the specification of geometrical and dimensional properties Spécification géométrique des produits (GPS) — Température normale de référence pour la spécification des propriétés géométriques et dimensionnelles Reference number ISO 1:2016(E) © ISO 2016 ISO 1:2016(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2016, Published in Switzerland All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester ISO copyright office Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2016 – All rights reserved ISO 1:2016(E) Contents Page Foreword iv Introduction v 1 Scope Terms and definitions Standard reference temperature value for the specification of geometrical and dimensional properties Annex A (informative) Use of the reference temperature specification Annex B (informative) Relation to the GPS matrix model Bibliography © ISO 2016 – All rights reserved iii ISO 1:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the different types of ISO documents should be noted This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html The committee responsible for this document is ISO/TC 213, Dimensional and geometrical product specifications and verification This third edition cancels and replaces the second edition (ISO 1:2002), which has been technically revised Specifically, the following points have changed: — the standard reference temperature definition has been included; consequently, the title, introduction and scope, have been changed; — the general definition of reference temperature has been included iv © ISO 2016 – All rights reserved ISO 1:2016(E) Introduction This International Standard is a geometrical product specification (GPS) standard and is to be regarded as a fundamental GPS Standard (see ISO 14638:2015[1]) For more detailed information on the relationship of this International Standard to other standards and the GPS matrix model, see Annex B The definitions of the units, including those of length and temperature, are adopted by the General Conference of Weights and Measures (CGPM) under the authority of the Convention of the Metre These definitions are maintained in the SI brochure.[5] The unit of length, the metre, is independent of temperature The current definition of the metre[6] is based on the distance light travels in vacuum during a unit of time However, a physical object is subject to thermal expansion and consequently, its geometrical and dimensional properties are dependent on its temperature Specifying a reference temperature allows the geometrical and dimensional properties of a physical object to be unambiguously stated © ISO 2016 – All rights reserved v INTERNATIONAL STANDARD ISO 1:2016(E) Geometrical product specifications (GPS) — Standard reference temperature for the specification of geometrical and dimensional properties 1 Scope This International Standard defines the concepts of a reference temperature and of the standard reference temperature, and specifies the standard reference temperature value for the specification of geometrical and dimensional properties of an object Some examples of geometrical and dimensional properties include size, location, orientation (including angle), form and surface texture of a workpiece This International Standard is also applicable to the definition of the measurand used in verification or calibration Terms and definitions For the purposes of this document, the following terms and definitions apply 2.1 reference temperature temperature of an object, having a uniform temperature, specified as part of the definition of a geometrical or dimensional property Note 1 to entry: The specification of a geometrical or dimensional property is typically given in technical product documentation, e.g., on an engineering drawing or in a CAD file, or in the specification of the measurand (the quantity intended to be measured) 2.2 standard reference temperature internationally agreed-upon reference temperature Note 1 to entry: In prior editions of this International Standard, the term “standard reference temperature” was defined as its assigned numerical value, i.e 20 °C In this edition, the definition of the reference temperature (2.1) and the assignment of a standardized value to this temperature are separately addressed (Clause 3) Standard reference temperature value for the specification of geometrical and dimensional properties The standard reference temperature value for the specification of geometrical and dimensional properties shall be fixed at 20 °C Unless otherwise explicitly specified, the reference temperature for geometrical and dimensional properties of workpieces shall be the standard reference temperature See Annex A for information on the use of the reference temperature specification NOTE 1 There is only one standard reference temperature value and it is fixed at 20 °C However, this does not prevent a different (non-standard) reference temperature from being specified for all geometrical and dimensional properties of a workpiece or for a specific geometrical or dimensional property on a workpiece, provided it is explicitly stated as part of the specification NOTE 2 The specification of a non-standard reference temperature may increase the measurement uncertainty during verification because most dimensional measuring equipment and gauges are calibrated with their measurand defined at the standard reference temperature © ISO 2016 – All rights reserved ISO 1:2016(E) Annex A (informative) Use of the reference temperature specification Specifying geometrical and dimensional properties at a single temperature value can raise questions since a) the functional requirements of any physical workpiece include other temperatures, b) verification cannot physically occur at an exact, uniform temperature Regarding the issue that workpiece functional requirements include other temperatures, it is important to note that a designer typically specifies not only the requirements on the geometric and dimensional properties of the workpiece (usually at the standard reference temperature value), but also separate requirements on the material properties of the workpiece Combining the knowledge of how a specified material behaves at different temperatures and the specified geometric and dimensional properties at a single temperature can allow a designer to ensure a workpiece will meet geometric and dimensional functional requirements over a range of temperatures Regarding the issue that any geometrical or dimensional verification inevitably occurs at a temperature different than the reference temperature, an adequate correction for that difference is necessary (see for example ISO/IEC Guide 99:2007, 2.3, Note 3[2]) In some cases, the correction might be zero (i.e no correction is performed); however, in all cases, it is necessary that the lack of knowledge of the exact correction be accounted for appropriately in the measurement uncertainty [see for example ISO/IEC GUIDE 98-3:2008, 3.3.2 b)[3]] Most measuring systems are designed to produce measurement results specified at the standard reference temperature value of 20 °C even though they may be operating at a different temperature In this case, deviations from the standard reference temperature for either the measuring system or the workpiece under measurement lead to additional measurement uncertainty contributors; see ISO/TR 16015[4] for additional information The term reference temperature should not be confused with the term rated operating condition 2 © ISO 2016 – All rights reserved ISO 1:2016(E) Annex B (informative) Relation to the GPS matrix model B.1 General The ISO GPS matrix model given in ISO 14638 gives an overview of the ISO GPS system of which this standard is a part B.2 Information about this International Standard and its use This International Standard is used whenever GPS specifications for workpieces and measuring equipment are given It constitutes the basis for the evaluation of measurement uncertainty B.3 Position in GPS matrix model This standard is a fundamental GPS standard The rules and principles given in this standard apply to all general and complementary ISO GPS standards in the ISO GPS matrix See Table B.1 Table B.1 — Position in the GPS matrix model Chain links A Size Distance Form Orientation Location Run-out Profile surface texture Areal surface texture Surface imperfections B Symbols Feature reand indica- quirements tions • • • • • • • • • • • • • • • • • • C D Feature Conformproperties ance and non-conformance E F Measurement Measurement equipment G Calibrations • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • B.4 Related International Standards The related standards are those of the chains of standards indicated in Table B.1 © ISO 2016 – All rights reserved ISO 1:2016(E) Bibliography [1] ISO 14638, Geometrical product specifications (GPS) — Matrix model [3] ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) [2] [4] [5] [6] 4 ISO/IEC Guide 99:2007, International vocabulary of metrology — Basic and general concepts and associated terms (VIM) ISO/TR 16015, Geometrical product specifications (GPS) — Systematic errors and contributions to measurement uncertainty of length measurement due to thermal influences SI Brochure: The International System of Units (SI) 8th Edition, 2006; updated in 2014 Bureau International des Poids et Mesures (BIPM) 17e Conférence Générale des Poids et Mesures (1983), Comptes Rendus p 97 (Resolution 1) Bureau International des Poids et Mesures (BIPM), 1984 © ISO 2016 – All rights reserved ISO 1:2016(E) ICS 17.040.01 Price based on pages © ISO 2016 – All rights reserved